One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,14)(17,18)(19,31)(20,37)(21,27)(22,28)(23,29)(24,30)(25,34)(26,38)(32,42)(33,46)(35,45)(36,44)(39,43)(40,47)(41,48) involution — undirected(2,5)(6,8)(10,14)(11,12)(17,19,23,35,24,36,22,34)(18,25,28,44,30,45,29,31)(20,32,38,41,39,21,33,40)(26,42,37,47,46,27,43,48)(1,3,4,7)(2,6,5,8)(9,11,13,12)(10,15,14,16)(17,20,22,33,24,39,23,38)(18,26,29,43,30,46,28,37)(19,32,34,40,36,21,35,41)(25,42,31,48,45,27,44,47)(9,12,13,11)(10,16,14,15)(17,21,24,32)(18,27,30,42)(19,33,36,38)(20,34,39,35)(22,41,23,40)(25,43,45,37)(26,31,46,44)(28,48,29,47)(10,14)(15,16)(17,22,24,23)(18,28,30,29)(19,34,36,35)(20,38,39,33)(21,40,32,41)(25,44,45,31)(26,43,46,37)(27,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.